Drive circuit device and motor having the same

Abstract

A heat sink member divides a circuit board into a first circuit part and a second circuit part. The first circuit part includes circuit elements, such as a transistor, an electric current sensing resistor and a choke coil, which generate heat upon operation thereof. The second circuit part includes a control circuit, which controls operation of the motor.

1. A drive circuit device for a motor, the drive circuit device comprising:
 a plurality of circuit elements that are provided to operate the motor and generate heat upon operation thereof; 
 a heat sink member that releases the heat, which is generated from one or more of the plurality of circuit elements; 
 a control circuit that controls operation of the motor; and 
 a circuit board that supports the plurality of circuit elements, the heat sink member and the control circuit, wherein: 
 the heat sink member divides the circuit board into a first circuit part and a second circuit part; 
 the first circuit part includes at least one of the plurality of circuit elements; and 
 the second circuit part includes the control circuit. 
 
   
   
     2. The drive circuit device according to  claim 1 , wherein the first circuit part includes all of the plurality of circuit elements. 
   
   
     3. The drive circuit device according to  claim 1 , wherein:
 the motor includes an armature; 
 the first circuit part is arranged on a first side of the heat sink member where the armature is located; and 
 the second circuit part is arranged on a second side of the heat sink member, which is opposite from the armature. 
 
   
   
     4. The drive circuit device according to  claim 1 , wherein:
 the heat sink member is made of metal; and 
 a height of the heat sink member, which is measured in a direction perpendicular to a plane of the circuit board, is greater than that of any of the plurality of circuit elements and that of the control circuit. 
 
   
   
     5. The drive circuit device according to  claim 1 , wherein the heat sink member has a plurality of heat sink fins at a top of the heat sink member. 
   
   
     6. A motor comprising a drive circuit device, which includes:
 a plurality of circuit elements that are provided to operate the motor and generate heat upon operation thereof; 
 a heat sink member that releases the heat, which is generated from one or more of the plurality of circuit elements; 
 a control circuit that controls operation of the motor; and 
 a circuit board that supports the plurality of circuit elements, the heat sink member and the control circuit, wherein: 
 the heat sink member divides the circuit board into a first circuit part and a second circuit part; 
 the first circuit part includes at least one of the plurality of circuit elements; and 
 the second circuit part includes the control circuit. 
 
   
   
     7. The motor according to  claim 6 , wherein the first circuit part includes all of the plurality of circuit elements. 
   
   
     8. The motor according to  claim 6 , further comprising an armature, wherein:
 the first circuit part is arranged on a first side of the heat sink member where the armature is located; and 
 the second circuit part is arranged on a second side of the heat sink member, which is opposite from the armature. 
 
   
   
     9. The motor according to  claim 6 , wherein:
 the heat sink member is made of metal; and 
 a height of the heat sink member, which is measured in a direction perpendicular to a plane of the circuit board, is greater than that of any of the plurality of circuit elements and that of the control circuit. 
 
   
   
     10. The motor according to  claim 6 , wherein the heat sink member has a plurality of heat sink fins at a top of the heat sink member.